OneNote and WebDav - has anyone got this to work?

I am using Kentico 8.1 and have successfully set up WebDav so we can edit Office files directly from the Kentico web site. However I am running into a brick wall with OneNote. Has anyone got this to work? whenever I try to create a new OneNote using my mapped drive I am getting the error "A device attached to the system is not functioning."

I have allowed the file extensions .one and .onetoc2. Is it just a case of adding some more file extensions or am I missing something else?

We are trying to migrate from SharePoint to Kentico where we can save our OneNotes just fine, but this is a stumbling block at the moment.